Take a copy of your "Saved Games" folder DCS will create a new one.
then test.
Reload Simshaker, UltraMFCD if you have them and try again. I did have a problem with both and reconfigured the 'Saved Games" folder and all good and working without any problems. That being said I will add various mods with JSGME see if any cause problems. I think the export.lua may hold the answer, but I am no expert just one mod at a time.
Chameleon_Silk mission work a treat :)